D. Ra

Ipecac at home--a health hazard?

D. Ra, Niederman Lg, 1981 .

Persistent otitis media with effusion: can it be predicted? A family practice follow-up study in children aged 6 months to 6 years.

D. Ra, van Balen Fa, 2000 .

[The sickness impact profile; results of an evaluation study of the Dutch version].

R. D. de Melker, F. Touw-Otten, H. M. Jacobs, 1990, Nederlands tijdschrift voor geneeskunde.